James f



UNITED STATES PATENT OEEicE.

JAMES F. MUNSIE, OF BROOKLY SPECIFICATION forming part of L To all whom it may co Be it known that ish subject, residing at Brookl of Kings and State of New ented certain newand useful Removablelnsulating-Liuingsor Conduits; anddohereby d to be a full, el

the same.

My inventi useful improvemen 1i 5 censtr or conduit is per its appointed place lining may be inse newed at pleasure, zo out disturbing or bre the duct or conduit y In the accompanyi of my invention, F

sectional view of an electr the same, and Fi z5 embodying longi ear, and eXac invention, such as will enable oth m the art to which it apper tudinal section and N, AssreNon Vro 'ri-ioMAs L. ooLEs, oE NEW vonk, N. Y.

lNSULATlNG-LINING.

etters Patent No. 426,201, dated April 22,

Application tiled January 17, lSQO.

Improvein Es F. MUNsrE, a Brityn, in the county York, have inents Electrical celare thefollowing t description of the ers skilled in tains to make and use on relates to certain new and ts in removable insulatinglocate rted or itself.

ng drawings, igure said duct or conduit.

Similar numerals of ref lar part-s in beth vi Referring to the outer protective in ing of the main bo ous rectilinear electrica Said main body portion be of iron or other cheap met or even of glass, cording to the the particular required. 4o up of an tions to exte USG nd in hole to man-hole throughout th sections being of u out. In Fig illustration) such a con two sections for joint, encircled by tinuou exig The duct or conduit i appropriate n 2 l have shown two of the adjacent sections of ming at their mee GWS.

drawings, 3 indicates the lating coating or covertien 4 of a continul conduit or duct.

may conveniently allie material, hard rubber, or the like, ac-

circumstances of su dy por encies or or location for which a str e system, niform diameter thr s rectilinear conduit,

the metallic collar 5, w

erence indicate simis to be made umber of abutting secaight line from manducts or conduits, the such that after the duct d in it is said ough- (for purposes of the ting ends a hich Serial No. 337,245. (No model.l

over the joint, so as to make an efficient and the two sections.

In practice the electrical ductor conduit, as above described, will be posed or laid within the ground or wit-hin the building destined to receive it, together with such other ducts or conduits as the entire service is liable to require. lVhenever any one of the ducts or conduits is to be put in use for the reception of an electrical conductor, said du ct or conduit is Iii-st provided with an insulating 6o interior lining of suoli capacity as to Afully occupy all the interior space that i 'ould otherwise exist between the inner walls of the duct and the conductor itself, this space being designedly left somewhat large, so that the lining may have considerable thickness. The said lining is made of a series of similar sections 0, molded from a substance of high insulating properties and which is waterproof and fire-proof. 6o

The sections f5 are hollow interiorly for the reception of the conducting-wire, and are slightly reamed at the inner edges of their meeting ends, as shown, so that there maybe nov accidental inward projection from said 7 5 edges to interfere with the passage of the conducting-wire through the series.

Then the duct or conduit is to receive its lining, the sections G are inserted one after d of the duct or conduit, 8o

the other into one en each being pushed forward by its successor d until the entire duct reason the lining becomes defectbe removed and a new one, 9o in whole or in part, substituted in its stead and without the necessity of disjointing or uncovering the conduit for that purpose. The sectional lining is furthermore desirable for the reason that the ducts or conduits, which are frequently posed side by side in considerable number', so as to meet prospective demands, need only be provided with linings, as desired, from time to time, thereby lessening the first cost of an eiiicient installation and also saving the linings-for use only during the periods when the calls of the service require them.

The substance of which I preferably construct the removable sections consists ordinarily of lire-clay, Portland cement, and paper-pulp in equal parts by weight. The paper-pulp is first rendered non-infiammable by being thoroughly washed or boiled in a solution of two anda half pounds common salt, three ounces sulphate of three ounces sulphate of zinc to three gallons of water. The pulp is then strained from the solution and intimately admixed with the fireclay and Portland cement, which are in a iinelypulverized condition, a sufficient quantity of a non-inflammable -agglutinating materialusuch as white glue and silicate ot' soda-being added to produce an efiieient adhesion or binding' together of the particles. The homogeneous mixture thus obtained is then pressed or molded under heavy hydraulic pressure into the form of the sections 6 orinto the form of a longer piece, afterward to be cut or sawed into such sections. The sections, being' thereupon thoroughly dried in a suitable oven, are then, while still hot, immersed in a hot bath of non-inilammable waterproofing compoundmsuch as tireproof paint-(known commercially as mineral paint,) or into a similar bath of india-rubber, which may thereafter be rendered noninflammable by vulcanization. The heated article will absorb the hot liquid until the pores are filled, thereby rendering the entire mass water-proof.

It will be noted on reference to Fig. f2

that

by means of my invention I can so arrange that the joint of the conduit will be covered internally by one ot' the insulating sections,

aluminum, and

thereby giving an additional safeguard at that point.

I'Iaving thus described my invention, what I claim is` l. A removable sectional lining' for electrical conduits, consisting of a series of sections of insulating' material iitting within the inner walls of the conduit and movable through said conduit from end to end, said sections being provided with hollow interiors communicating' with each other and forming a continuousy passage-way for the insert-ion and withdrawal of the electrical conductor, substantially as described.

2. A removable sectionallining for electrical conduits, consisting of a series of sections of insulating' material iittiug within the inner walls of the conduit and movable through said conduit from end to end, said sections being provided with hollow interiors communicating' with each other and forming a continuous passageway for the insertion and withdrawal of the electrical conductor, and the inner edges of the abutting ends of the sections being beveled or roamed out, substantially as described.

3. A removable sectional lining for electri cal conduits, consisting' of a series of sections of insulating material fitting within the inner walls of the conduit and movable through said conduit from end to end, said sections being provided with holloi r interiors communicating with each other and forming a continuous passageway for the insertion and withdrawal of the electrical conductor, the conduit joints being covered .internally by said sections, substantiall f as described.

In testimony whereof I affix .m y signature in presence ot' two witnesses.

JAMES F. B'IUNSIE. Witnesses:

J oHN C. PENNIE, A. M. PARKNs. 

